This seems to happen to me frequently - I'll pause the debugger and the call stack will show up with a bunch of invisible entries. You can see that I've expanded the invisible list and highlighted one. If I use the 'copy stack' context menu item, it copies everything to the clipboard, so I know it's there. Is this a known bug? Is there a fix?
Also, no idea if it's related, but Peripherals+ only works sporadically. You can see that nothing is showing up in the Peripherals+ pane.
I'm running MCUX 10.1.1_606, and my debug interface is a P&E Cyclone ACP.